MOBILE CRANE AND METHOD FOR ANGLING A MAIN JIB EXTENSION RELATIVE TO A MAIN JIB OF A MOBILE CRANE

• US 20180327234A1
• Filed: 11/08/2016
• Published: 11/15/2018
• Est. Priority Date: 11/10/2015
• Status: Active Grant

• Current Assignee: Tadano Demag GmbH (Tadano Limited)
• Original Assignee: Terex Global GmbH (Terex Corporation)
• Inventors: MARTIN, Michael, FESS, Traugott, KUHN, Roland
• Granted Patent: US 10,647,553 B2
• Time in Patent Office: Days
• CPC Class Codes: B66C 23/68 foldable or otherwise adjustable in configuration
• CPC Class Codes: B66C 23/701 telescopic
• CPC Class Codes: B66C 23/702 with a jib extension boom
• CPC Class Codes: B66C 23/82 Luffing gear
• CPC Class Codes: B66C 2700/0392 Movement of the crane arm; Coupling of the crane arm with the counterweights; Safety devices for the movement of the arm

Abstract

A mobile crane having a main jib that is mounted thereupon for luffing and that can be oriented by means of a luffing cylinder, and a main jib extension which is detachably connected to a main jib head of the main jib by upper and lower bolts, it being possible to angle the main jib extension about a luffing axis relative to the main jib proceeding from a base position following release of the upper or lower bolts and using an angle drive, the angle drive engaging with a foot of the main jib extension, a maximum angling angle being delimited by an adjustable angling plate, and the angling plate engaging with the foot of the main jib extension and the main jib head. The angle drive is a component of an angling plate in the form of a combi-angling plate.

Claims

1. A mobile crane with a main jib luffably mounted thereon and able to be raised via a luffing cylinder, and with a main jib extension releasably connected to a main jib head of the main jib via upper and lower bolts, the main jib extension, starting from a basic position, is able to be angled about a luffing axis relative to the main jib by an angling drive, wherein the angling drive is a component of a combi-angling plate which delimits a maximum angling angle in a mechanically adjustable manner, and wherein the angling drive engages on a foot of the main jib extension and the main jib head and the combi-angling plate comprises a sliding plate, a guiding plate and the angling drive, and wherein the combi-angling plate can be modified in length via the angling drive and the angling drive drivingly engages on the one hand on the sliding plate and on the other hand on the guiding plate, and wherein the sliding plate can be displaced in a length-modifiable manner relative to the guiding plate via the angling drive.

2. The mobile crane as claimed in claim 1, wherein the angling drive is releasably fastened to the sliding plate.

3. The mobile crane as claimed in claim 2, wherein the combi-angling plate on the one hand engages on the main jib head and on the other hand on the main jib extension.

4. The mobile crane as claimed in claim 3, wherein the sliding plate is displaceably guided in the guiding plate and the angling drive is disposed in the guiding plate.

5. The mobile crane as claimed in claim 4, via a stop bolt, a maximum displacement of the sliding plate relative to the guiding plate can be delimited.

6. The mobile crane as claimed in claim 5, wherein the luffing axis is formed in the region of the top chord of the main jib extension or of the bottom chord of the main jib extension and wherein the combi-angling plate is disposed in the region of the bottom chord of the main jib extension or of the top chord of the main jib extension.

7. The mobile crane as claimed in claim 6, wherein the angling drive is designed such that the main jib extension can be lifted and lowered in a pivoting manner about the luffing axis against the effect of the gravitational force of the main jib extension.

8. The mobile crane as claimed in claim 7, wherein the angling drive is designed as a hydraulic cylinder with a housing and a rod.

9. The mobile crane as claimed in claim 8, wherein two combi-angling plates are disposed in parallel and spaced apart from one another and the two combi-angling plates are preferably disposed in corner regions of the main jib extension.

10. The mobile crane as claimed in claim 9, wherein the combi-angling plate replaces a part of the top chord or of the bottom chord of the main jib extension in the region of the foot of the main jib extension.

11. The mobile crane as claimed in claim 10, wherein the sliding plate is pivotably mounted on the main jib head, the guiding plate is pivotably mounted on the main jib extension and by an insertable stop bolt a maximum displacement of the sliding plate in the guiding plate can be delimited.

14. The mobile crane as claimed in claim 1, wherein the combi-angling plate on the one hand engages on the main jib head and on the other hand on the main jib extension.

15. The mobile crane as claimed in claim 1, wherein the sliding plate is displaceably guided in the guiding plate and the angling drive is disposed in the guiding plate.

16. The mobile crane as claimed in claim 1, via a stop bolt, a maximum displacement of the sliding plate relative to the guiding plate can be delimited.

17. The mobile crane as claimed in claim 1, wherein the luffing axis is formed in the region of the top chord of the main jib extension or of the bottom chord of the main jib extension and wherein the combi-angling plate is disposed in the region of the bottom chord of the main jib extension or of the top chord of the main jib extension.

18. The mobile crane as claimed in claim 1, wherein the angling drive is designed such that the main jib extension can be lifted and lowered in a pivoting manner about the luffing axis against the effect of the gravitational force of the main jib extension.

19. The mobile crane as claimed in claim 1, wherein the angling drive is designed as a hydraulic cylinder with a housing and a rod.

20. The mobile crane as claimed in claim 1, wherein two combi-angling plates are disposed in parallel and spaced apart from one another and the two combi-angling plates are preferably disposed in corner regions of the main jib extension.

21. The mobile crane as claimed in claim 1, wherein the combi-angling plate replaces a part of the top chord or of the bottom chord of the main jib extension in the region of the foot of the main jib extension.

22. The mobile crane as claimed in claim 14, wherein the sliding plate is pivotably mounted on the main jib head, the guiding plate is pivotably mounted on the main jib extension and by an insertable stop bolt a maximum displacement of the sliding plate in the guiding plate can be delimited.

12. (canceled)

13. (canceled)

23. A method for angling a main jib extension relative to a main jib of a mobile crane, wherein the main jib is luffably mounted on the mobile crane and can be raised via a luffing cylinder, and wherein the main jib extension is releasably connected to a main jib head of the main jib and an angling drive engages on a foot of the main jib extension and on a main jib head, said method comprising:

lifting the main jib extension by the angling drive, from a basic position about a luffing axis relative to the main jib until a locking bolt for a zero degree position within the combi-angling plate is relieved, wherein the angling drive is a component of a combi-angling plate that delimits a maximum angling angle in a mechanically adjustable manner and can be modified in length via the angling drive;

removing the locking bolt;

drivingly coupling the angling drive to the combi-angling plate if the angling drive is not already coupled to the combi-angling plate;

lowering the main jib extension via the angling drive until the maximum angling position is reached or a head of the main jib extension comes into contact with a ground surface;

drivingly separating the angling drive from the combi-angling plate; and

angling the main jib extension by raising the main jib when the maximum angling position has not yet been reached until the desired angling angle is reached.

24. The method as claimed in claim 23, further comprising inserting a stop bolt into the combi-angling plate after said drivingly separating the angling drive, wherein the maximum extension of the combi-angling plate and therefore the maximum angling angle is delimited by the stop bolt.